Megaselia loneviolaae sp. n.

(Figs 79–91)

Material examined. Holotype male, DENMARK, SJ, Draved Skov, 21.vi–13.vii.2014, E. Bøggild (60.1404176, CUMZ-8-58). Description. Male. Frons and postpedicels as Fig. 79. Palps and proboscis as Fig. 80. The postpedicels have a few large SPS vesicles which are not smoothly spherical (Figs 81–82). Cheek with 5 bristles, the lowest being longer and more robust, and jowl with 2 that are longer and more robust. Left face of thorax as Fig. 83, having 3 notopleural bristles and no cleft in front of these, mesopleuron with 13 hairs. Scutellum with an anterior pair of hairs and a posterior pair of bristles. Abdominal tergites light brown with numerous hairs which are longest at the rear of T6). Venter gray, and with hairs on segments 3–6. Hypopygium as Figs 84–87. Legs light brown to brownish yellow. Fore tarsus (Fig. 89) with posterodorsal hair palisade on segments 1–5 and ratios of segment lengths 2.75: 1.5: 1.3: 1.1: 1. Dorsal hair palisade of mid tibia extends about 0.9 times its length (Fig 89). Hind femur as Fig. 90. Hind tibia with a dozen differentiated posterodorsal hairs, without anterodorsals, and spinules of apical combs simple. Wings (Fig. 91) 2.2 mm long. Costal index 0.48. Costal ratios 5.0–5.1: 2.3: 1. Costal cilia (of section 3) 0.16–0.17 mm long. Hair at base of vein 3 only 0.03 mm long. With 4 axillary bristles, the outermost being 0.14 mm long. Sc not reaching R1. Haltere knob dusky.

Recognition. In the key of Lundbeck (1922) to Group IV couplet 27 or 30, but the hypopygium differs from these species. In the key to the males of the British Isles (Disney, 1989) it runs to couplet 121. Lead 1 proceeds to 122 where the hypopygium differs from thee two species covered. Lead 2 proceeds to couplet 139 lead 2. M. subpleuralis (Wood), but its hypopygium differs; also the hair at the base of vein 3 is longer (0.08–0.11 mm long). Other species running to this couplet have only 2 axillary bristles. In the key of Schmitz & Beyer (1965) to Abteilung IV Zweite Reihe it readily runs to couplet 57 where the choice is between a yellow or dark haltere knob. Our specimen has a dusky knob but not dark brown. Taking lead 1 one runs to M. subpleuralis at couplet 81 or to couplet 83, where the costal index is intermediate. Lead 1 proceeds to couplet 83 to M. fuscovariana Schmitz, which differs in having thicker fore tarsal segments and a longer hair at the base of vein 3. Lead 2 from couplet 83 proceeds to couplet 97, where both species lack hypandrial lobes as well as a subsequently described species. M. fuscovariana, distinguished above, will also run to this couplet.

Etymology. Named after Lone Viola Sørensen a close colleague of Esben Bøggild.